Improvements patterns for molding pipes



UNITED STATES PATENT OFFICE.

GEORGE ROSS, OF NEVPORT, KENTUCKY.

IMPROVEMENTIN PATTERNS FOR MOLDING PIPES.

Specilication forming part 0f Letters Patent No. 37.981, dated March 24,1563.

To @ZZ whom it may concern:

Be it known that I, GEORGE Ross, of Newport, in the county of Campbelland State of Kentucky, have invented a new and useful Improvement inPatterns for Molding Pipes, &c.; and I do hereby declare that thefollowing is a full,clear, and exact description ofthe same, referencebeing had to the accompanying drawings, forming a part of thisspecification, in which- Figure 1 represents a vertical central sectionof my invention. Fig. 2 is a horizontal section of the same, taken inthe plane indicated by the line x m, Fig. l.

Similar letters oi' reference in both views indicate correspondingparts.

The object of this invention is to strengthen cast-iron pipes at suchplaces where the same have to be tapped for small or branch'pipes.

The invention consists in the application to the pattern which is usedinmolding pipes of a sectional ring or belt, or ot' a series of movablebuttons arranged in such a manner that the same can be pushed out beyondthe surface of the pattern, and drawn back again while the pattern is inthe sand, thus producing a belt or projections which strengthen the pipeand increase the thickness or" the metal at such places where the pipeis to be tapped. 1

The invention consists, also, inthe arrangement of a rising and fallingconical plunger acting upon the ends of studs which are inserted intothe several sections of the ring or belt on the pattern, in combinationwithv springs, in such a manner that on depreising said plunger thesectional belt is forced out beyond the surface of the pattern, and onraising the plunger said sections are drawn back automatically by theaction of the springs.

To enable others skilled in the art to make and use my invention, I willproceed to describe it with reference to the drawings.

A represents a pattern made of cast-iron or other suitable material, andused in molding pipes. Such patterns are generally from ten to twelvefeet long, and they, together with the flasks, are placed in a verticalposition into a pit, and the sand is rammed round them, and after thepattern has been drawn a suitable core is inserted, and the mold isready for casting. Vith ordinary patterns the bodies of the pipes becomeof a uniform thickness from end to cnd,and if the pipe is to be tappedto receive a branch pipe the metal aiords a very short hold to thethread, and the slightest accident causes said branch pipes to workloose. rlhis difficulty I have obviated by applying to the pattern aring or belt, B, made of brass or other suitable material, and placedinto a recess, a, of such a depth that when the ring is in its outersurface is ilush with the surface of the pattern. The ring B is made infour (more or less) sections, b, and the adjoining sections overlap eachother by means of projecting lips c, as clearly shown in Fig. 2, so thatsaid sections can be expanded without opening a gap between their ends.Each of the sections b is provided with a stud, d, which extends intothe interior of the pattern.

C are springs, the ends of which are forked and catch into annular necksin the inner ends of the studs d, and which have a tendency to force thestuds, and with them the sections of the ring B, toward the center ofthe pattern.

D is a conical plunger which is firmly secured to a rod, E. This rod isguided below by a plate, F, secured in the pattern below the ring, andabove by a plate, fastened to the top edge of the pattern. A nut, e,prevents said rod from coming out. rPhe rod E is provided with a handle,j", whereby the plunger is raised or depressed. On depressing theplunger it acts upon the inner ends of the studs d, and the sections ofthe rings B are forced out beyond the surface ofthe pattern. On raisingthe plunger the sections b of the ring recede simultaneously by theaction of the springs C. The handlef of the rod E extends beyond theupper end of the pattern, and after the sand has been rammed round thepattern said handle is depressed, and the ring B leaves a circularimpression in the sand. On raising the handle the ring recedes and thepat-tern can now be withdrawn in the ordilllly 1112121111612 It isobvious that instead of the movable ring B single sections or buttonsmight be eniployed at certain intervals to strengthen the niet-al atsuch places where the pipes are to be tapped; but the belts produced bythe movable rings are more convenient, because they permit of tappingthe pipe on any side.

XV hat I claim as new, and desire to secure by Letters Patent, is-

1. The application to the pattern A of a pable of being pushed out anddrawn in While and for the purpose shown and described.

the pattern is in the sand in the manner and for the purposesubstentiilly as specified. GEORGE ROSS' 2. The arrangement of therising and falling conical plunger D and springs C, in combination withthe studs (Z and sectional ring movable secbionalring, B,o1itsequivalent, cw B, constructed and operating substantially as XVitnesses:

M. S. PARTRIDGE, DANIEL RoBnRTsoN.

